INNER CODE UNIT · JavaScript

sceneOpacity

mario-andreschak/FLUJO · githubpages/short/app.js:264

  function sceneOpacity(t, start, end, fadeIn = 1.15, fadeOut = 1.15) {
    if (t < start || t > end) return 0;
    const enter = smoothstep(invLerp(start, start + fadeIn, t));
    const leave = 1 - smoothstep(invLerp(end - fadeOut, end, t));
    return Math.min(enter, leave);
  }

  function activateScene(scene, t) {
    const el = sceneEls.get(scene.id);
    const opacity = sceneOpacity(t, scene.start, scene.end);
    el.style.opacity = opacity.toFixed(4);
    el.style.visibility = opacity > .001 ? "visible" : "hidden";
    return { el, local: t - scene.start, opacity };
  }

  function reveal(el, local, at, duration = .8, options = {}) {
    const {
      x = 0,

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